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topic 4399

Nitric Acid filtration of heavy metals


(2000)

We are a zinc die caster/Plater (same facility), and use nitric acid to strip our built-up plating racks. The spent nitric is being sent off site. I have read an article that suggests using an "Ultrafilter"loop to remove the heavy metals, and prolong the life of the nitric, or can reduce it's composition of heavy metals; than it can be disposed of in a more effective method. This makes sense since it is the heavy metals that are causing the classification that makes the nitric such a problem.

First question, Is anyone using this technique, and if not, does it make sense ?

Joseph DeAmicis
Academy - Edison,New Jersey


(2000)

Joseph,

You did not mention what type of plating you are doing but, since you are using Nitric Acid to strip your racks I am assuming you are either doing Nickel, Chrome, or Copper plating.

We manufacture a Diffusion Dialysis system which has been effective in recovering nitric acid from all three of these processes. You are correct in stating that the resulting waste stream is much more easily waste treated. Contact me if you would like to discuss this further.

Tony D'Amato
Zero Discharge Technologies Inc. - Chicopee, Massachusetts



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